Improvement in wood-bending machines



Stanza A. G. SNYDER, OF ASHTABULA, CHIC).

Leuerspazent No. 87,981, ama Ma/r'ch 16,1869, Y

To all whom it may concern Be it known that I, A. G. SNYDER, ofAshtabula, in the county of Ashtabula, vented certain new and usefulImprovements in Wood- Bending Machines; and I do hereby declare that thefollowingis a full and complete description of the seam, reference beinghad to the accompanying drawing, making a part of this specification, inwhich-` Figure l is aftop view of the machine.

Figure 2 is a side view. l

Figure 3 is an end view. Y

Like letters of vreference refer to like parts In fig. 1, A are sills,across which. are secured the beams, or cross-ties B.

These beams and sills constitute the frame ofthe machine, ou which thethills are bent, as will hereafter he shown.

O, fig. 2, is a bed, on one end of which is secured an abutment-shoe, D,and on the opposite end is a head, or an abutment, E, through which isprojected a screw, F, working in a nut, a. The end of said screw isprovided' with a jam-plate b.'

To the shoe-abutment D is attached va plate, or strap of metal, G, theopposite end of which terminates in a hook, and fastened or hooked on tothe' loop H, said loop being firmly secured to the bed C.

-It-will be observed that the end of the strap G is thickened up by theaddition of ajam-plate, G', forming the hook referred to., d

J is a yoke,secnred to the strap byla loop, Ka

Having thus described the construction and arrangement of the machine,Il will now`proceed to show the practical operation of the same.

y It well known, that in bending timber, there is an vextension andcontraction ofthe wood, the inner curvature being contracted, orcrimped, more or less, and the outer curvature suffering a correspondingeXtension. In consequence oi' this extension of the wood, the bre isvery liable to tear asunder, splintering and breaking, or irregularlybending, at the point of greatest curvature.

In order to prevent this extension of the wood, and cause thebending tobe the result o f the contraction of the inner curvature,`and therebysave the loss consequent on the breaking of the work, I confine thatsection of the timber to be bent, between end-abut- .,ments, saidabutments receiving the end-pressure, the consequence ofthe extensionofthe wood.

Thus, in iig. l, A represents a thill, or shaft to be bent. This is laidupon the bed O, with the inner end embraced by and resting against theslice-abutment D, whereas the outer end is secured by the abutment B',.said abutment being fixed to a strap, O', lying along against the endof the thill, the abutment being made to pass around the end. A

and State of Ohio, have in-k tween the shoe and first binder c.

When the thill is thus laid out upon the bed, the screw F is turneddown, thereby bringing astrong pressure endwise upon it, the effect ofwhich will be to canse the thillto bend upward from the middle. Toprevent this deflection ofthe thill at that point, binders care lixedacross it, so that if the thill bends, it must do so belhe thill isprevented from pushing forward, on the application of the screw, by thestrap being hooked to the loop H.

The tension thus given to that part of the thill, is retained, by thestrap G being clamped to the thill, by the insertion of the wedge H inthe yoke J under the plate J The said plate in its capacity, acts as alever, and the wedge being driven under it, the thill and strap are rmlysecured together, retaining thereby whatever amount of deilection thethill may have received in consequence of the application of the screw.

The outer end of the thill is in like manner secured to a strap, O', theend abutting in the angle B of the same, against which the jam-plate bengages.

The strap and thill are then bound together by the yoke e, keyed up bythe wedge f,

In this condition, the thill is taken from the bed, and the end insertedin the foot of the former N, so that the strap G will be upward, andwhich is then bent over the former, down upon the cross-ties B, andsecured there by the binders h.

The outer end of the thill is curved by the former o being drivenbetween them, and forcing them outward against the shoulders P.

By the application of the straps, in the manner as described, the woodis prevented from splintering, for the reason that the strap and clampprevent any ex` tension of the wood while being bent; hence there can beno tearing apart of the fibre, the bending being effected by theconstruction or upsetting of the inner curvature of the bend.

I am aware that end-abutments have been used in wood-bending machines,for v the purpose of resisting the end-pressure' consequent on theextension of the timber, but these have been used in machines forbending felloes, or other work, when the entire length of vthe stu isbent, instead of one end, or the ends only, as in the shaping of abuggy-thill; hence the application of end-abutments, broadly, I donotclaim.

What I claim as my improvement, and desire to secure by Letters Patent,is

The abutment-shoe D, strap G,jamplate and hook G', yoke J, plate J andwedge H, all constructed and arranged to operate in combination with theloop H and bed O, for thepurpose specied.

' A. G. SNYDER.

Witnesses: f

W. H. BURRIDGE, J. HOLMES.

